如果之前有人问过,请道歉。我试图从字符串中删除标点符号。我知道怎么做,但我不明白maketrans和Python之间的区别。更具体地说,为什么下面的代码方案1从传入的字符串中删除所有标点符号,但是方案2没有?
SCENARIO 1
def average(x):
table = x.maketrans('.,?!:','$$$$$')
x = x.translate(table)
x = x.replace('$', '')
lst1 = x.split()
lst2 = []
for i in lst1:
length = len(i)
lst2.append(len(i))
average = sum(lst2) / len(lst2)
return average
str1 = input("Enter a sentence:")
print('The average amount of chars in that sentence is: ', average(str1))
情景2
def average(x):
x = x.replace('.,?!:','')
lst1 = x.split()
lst2 = []
for i in lst1:
length = len(i)
lst2.append(len(i))
average = sum(lst2) / len(lst2)
return average
str1 = input("Enter a sentence:")
print('The average amount of chars in that sentence is: ', average(str1))
答案 0 :(得分:2)
.replace()
执行 substring 替换 - 它尝试将第一个参数的整体匹配为一个块,并将其替换为第二个参数的全部。
.maketrans
+ .translate
执行字符级翻译 - 它会将第一个参数中的每个字符替换为第二个字符中的相应字符。